diff --git a/libsrc/occ/python_occ_shapes.cpp b/libsrc/occ/python_occ_shapes.cpp
index 76949344..795a7947 100644
--- a/libsrc/occ/python_occ_shapes.cpp
+++ b/libsrc/occ/python_occ_shapes.cpp
@@ -1964,21 +1964,21 @@ DLL_HEADER void ExportNgOCCShapes(py::module &m)
       })
     .def("Edge", [](Handle(Geom2d_Curve) curve) {
         // static Geom_Plane surf{gp_Ax3()}; // crashes in nbconvert ???
-        static auto surf = new Geom_Plane{gp_Ax3()};          
+        static auto surf = Handle(Geom_Plane)(new Geom_Plane{gp_Ax3()});
         auto edge = BRepBuilderAPI_MakeEdge(curve, surf).Edge();
         BRepLib::BuildCurves3d(edge);
         return edge;
       })
     .def("Wire", [](Handle(Geom2d_Curve) curve) {
         // static Geom_Plane surf{gp_Ax3()}; // crashes in nbconvert ???
-        static auto surf = new Geom_Plane{gp_Ax3()};          
+        static auto surf = Handle(Geom_Plane)(new Geom_Plane{gp_Ax3()});
         auto edge = BRepBuilderAPI_MakeEdge(curve, surf).Edge();
         BRepLib::BuildCurves3d(edge);
         return BRepBuilderAPI_MakeWire(edge).Wire();                
       })
     .def("Face", [](Handle(Geom2d_Curve) curve) {
         // static Geom_Plane surf{gp_Ax3()};  // crashes in nbconvert ???
-        static auto surf = new Geom_Plane{gp_Ax3()};
+        static auto surf = Handle(Geom_Plane)(new Geom_Plane{gp_Ax3()});
         auto edge = BRepBuilderAPI_MakeEdge(curve, surf).Edge();
         BRepLib::BuildCurves3d(edge);        
         auto wire = BRepBuilderAPI_MakeWire(edge).Wire();